src/make-config-h.sh

   1 #!/bin/sh
   2 set -e
   3 die() { >&2 printf '%s: fatal: %s\n' "${0##*/}" "$*"; exit 1; }
   4 warn() { >&2 printf '%s: %s\n' "${0##*/}" "$*"; }
   5
   6 CC="$1"
   7 : "${CC:=cc}"
   8
   9 [ "${V#*[!0-9]}" = "$V" ] || V=1
  10 V="$(( 0 + ${V:-0} ))"
  11 NOERR='2>&1'
  12 [ $V -le 1 ] || NOERR=
  13
  14 TMPD=
  15 cleanup() {
  16         [ $V -le 1 ] || [ -z "$TMPD" ] || warn "retaining temp dir $TMPD"
  17         [ $V -ge 2 ] || [ -z "$TMPD" ] || rm -rf "$TMPD"
  18 }
  19 trap cleanup EXIT
  20 trap 'exit 129' HUP
  21 trap 'exit 130' INT
  22 trap 'exit 131' QUIT
  23 trap 'exit 134' ABRT
  24 trap 'exit 141' PIPE
  25 trap 'exit 142' ALRM
  26 trap 'exit 143' TERM
  27
  28 # safe printf-based version of echo
  29 echol() { printf '%s\n' "$*"; }
  30
  31 # set variable with name $1 to name of new writable temp file with .$2 extension
  32 # if $2 omitted default is "c"
  33 v_get_temp_ext() {
  34         if [ -z "$TMPD" ]; then
  35                 TMPD="$(mktemp -d /tmp/make-config-h.XXXXXX)" && [ -n "$TMPD" ] && [ -w "$TMPD" ] ||
  36                         die "could not make temp file directory"
  37         fi
  38         _tmpf="$(mktemp "$TMPD/source-XXXXXX")" && [ -n "$_tmpf" ] && [ -w "$_tmpf" ] ||
  39                 die "could not make temp file"
  40         mv "$_tmpf" "$_tmpf.${2:-c}" || die "could not rename temp file to have .${2:-c} extension"
  41         eval "$1"'="$_tmpf.${2:-c}"'
  42 }
  43
  44 # attempt to compile "C" source file
  45 # on standard input with status as only result
  46 # $1 contains eval'd extra compile args
  47 testcomp() {
  48         v_get_temp_ext _src
  49         v_get_temp_ext _obj o
  50         cat >"$_src"
  51         eval '"$CC" -c -o "$_obj" $1 "$_src" >/dev/null '"$NOERR"
  52 }
  53
  54 # attempt to compile and link "C" source file
  55 # on standard input with status as only result
  56 # $1 contains eval'd extra compile args
  57 # $2 contains eval'd extra link args
  58 testlink() {
  59         v_get_temp_ext _src
  60         v_get_temp_ext _obj o
  61         v_get_temp_ext _bin bin
  62         cat >"$_src"
  63         eval '"$CC" -c -o "$_obj" $1 "$_src" >/dev/null '"$NOERR" &&
  64         eval '"$CC" -o "$_bin" $2 "$_obj" >/dev/null '"$NOERR"
  65 }
  66
  67 # $1 is base name of macro to use (i.e. HAVE_$1)
  68 # $2 is routine to call (either testcomp or testlink)
  69 # $3... are optional options to $2
  70 # standard input is source to compile or compile+link
  71 emitresult() {
  72         _macro="$1"
  73         shift
  74         [ $V -eq 0 ] || warn "checking for $_macro..."
  75         if "$@"; then
  76                 [ $V -eq 0 ] || warn "  ...HAVE_$_macro => yes"
  77                 echol "#define HAVE_$_macro 1"
  78         else
  79                 [ $V -eq 0 ] || warn "  ...HAVE_$_macro => no"
  80                 echol "#undef HAVE_$_macro"
  81         fi
  82 }
  83
  84 # Check for IPV6 (see RFC 3493)
  85 emitresult IPV6 testcomp <<-IPV6
  86         #include <sys/types.h>
  87         #include <sys/socket.h>
  88         #include <netinet/in.h>
  89         #if defined(IN6ADDR_ANY_INIT) && defined(AF_INET6)
  90         extern void itworks(void);
  91         #else
  92         #error missing IPV6
  93         #endif
  94 IPV6
  95
  96 # Check for inet_ntop (see RFC 3493)
  97 # this is separate in case IPV6 is present but inet_ntop is not
  98 emitresult INET_NTOP testlink <<-INET_NTOP
  99         #include <sys/types.h>
 100         #include <sys/socket.h>
 101         #include <netinet/in.h>
 102         #include <arpa/inet.h>
 103         #include <stdio.h>
 104         static void check(void)
 105         {
 106                 const char *s;
 107                 struct in6_addr addr;
 108                 char str[256];
 109                 s = inet_ntop(AF_INET6, &addr, str, (socklen_t)sizeof(str));
 110                 if (s) puts(s);
 111         }
 112         int main() {
 113                 check();
 114                 return 0;
 115         }
 116 INET_NTOP